1. Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
2. Division of Integrative Genomics, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
3. Department of Obstetrics and Gynecology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
4. Data Science Center, Promotion Unit, Institute of Health Science Innovation for Medical Care, Hokkaido University Hospital, Sapporo, Japan.
5. Department of Obstetrics and Gynecology, Kindai University Faculty of Medicine, Osaka, Japan.
6. Department of Obstetrics and Gynecology, Tohoku University Graduate School of Medicine, Sendai, Japan.